parallel:
Doesn't play well with itemize and enumerate environments.New info: Also creates an undesired vertical space on the non-equation column when using a display equation environment (see also illustration for parcolumns farther below).

1 Answer
1

If you go with celenius' answer to your old question and use the tufte-latex package, those problems don't appear. With its narrower right hand column and smaller font size, it's probably even better suited to your task of taking notes:

\documentclass[a4paper,justified]{tufte-handout}
\usepackage{lipsum}
\usepackage[retainorgcmds]{IEEEtrantools}
\begin{document}
\lipsum[2]
\marginnote{Here's some text that goes on the right side of the page. We'll make it long enough so the line wraps.
\begin{IEEEeqnarray}{rCl}
E & = & mc^2
\end{IEEEeqnarray}
Some useful greetings:
\begin{itemize}
\item Hello World!
\item Yeah!
\item Hey there!
\end{itemize}
}
\lipsum[1]
\end{document}

With a bit of tweaking, you can also get equal column widths and font sizes:

+1 @Jake: I appreciate the demo :). Unfortunately, the two parallel texts don't align well at the top edge. I was also looking for something like, what if my marginnote is longer vertically than the main text that it is marginnote-ing? I would want that the next chunk of main text would vskip to the bottom of the previous marginnote. I just might have to try the longtable environment.
–
KitJan 19 '11 at 0:10

In the tufte-latex classes, the margin notes are designed so that the baseline of the first line of the margin note aligns with the baseline of the text it was called from. If the margin note is longer than the main text, it will continue past the main text (and can even run off the page). This is something I hope to correct in a future version. Given that you want the next main text paragraph to start after the end of the longest block of text (main or margin note), it would seem that \marginnote isn't what you're looking for.
–
godbykJan 20 '11 at 21:42